Malicious PDF — malware analysis report

Static analysis result for SHA-256 62839443ec609640…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 13:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ae7ad9600fd1a6e2bd7bfdf85bfdaa63 SHA-1: 6178f92f71611d0abd758af86c50fde39fee013f SHA-256: 62839443ec60964039e390e63d9d6601ebef0d899a45a66305321c0f0b169142
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the attack pattern of luring users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://irlanc.ru/uplcv?utm_term=jab+we+met+full+movie+download PDF link annotation
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131d9d65c631---simibepixikozefepowovetid.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/21960746131.pdfIn PDF document text
    • http://ccsl.asia/files/30414032274.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/55159578431.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/47243115845.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210909135759.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4eb14f627---weguwemud.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/9876575317.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/72d90628bac2d0d857aa00055982d2c4/luxazo.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/98600010197.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/netetepofumirupepovo.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/fepeba.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/12583520507.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/56845051137.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/mabunulasujaguvidugu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfe9fda14c---55020137108.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/65025731057.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349757ee94e---62633682439.pdfIn PDF document text
    • http://wohntraumgmbh.at/54820366574.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/xolikeroneviwatazomexefo.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/suninofobakefupitamupu.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/70233486806.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD692 10628 bytes
SHA-256: 810d2ef52b6eb4c9c32703e7314ba313d5c36437ffdf876d6770ac44e4a4f468
font_01_sfnt_off0000eee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE7 17140 bytes
SHA-256: c04b0a8844d4312396ff92c724300839d64a1194feef1af62fc8a334e1f4f068
font_02_sfnt_off00011b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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